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- W2019591812 abstract "The effects of multiple doses of doxorubicin (DXR) on myocardial beta-adrenergic receptor density and dissociation constant were investigated in male Sprague Dawley rats. The rats received DXR (2 mg/kg) or vehicle weekly by the SC route for 13 weeks. One group of DXR-treated rats plus corresponding controls were sacrificed at 14 weeks, one week after the last dose. Another group of DXR-treated rats plus corresponding controls were sacrificed at 19 weeks, six weeks after the last dose. The myocardial beta-adrenergic receptor was characterized by radio-ligand binding studies using [125I]iodocyanopindolol. Beta--receptor densities in DXR-treated rats of 7.0 and 7.4 fm/mg protein were unchanged from control levels of 7.2 fm/mg protein at both 14 and 19 weeks, respectively. Receptor dissociation constants in DXR-treated rats of 36.7 and 36.9 pM were increased over control levels of 24.6 and 30.0 pM at 14 and 19 weeks, respectively. However, the change in dissociation constant is only significant at 14 weeks. The increased dissociation constants suggest diminished agonist binding affinity of the myocardial beta-receptor. This impaired response of the receptor to catecholamines would tend to diminish the ability of myocardium to adequately respond to adrenergic stimuli." @default.
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- W2019591812 date "1986-08-01" @default.
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- W2019591812 title "Effects of chronic administration of doxorubicin on myocardial beta-adrenergec receptors" @default.
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- W2019591812 doi "https://doi.org/10.1016/0024-3205(86)90021-4" @default.
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